期刊
THEORETICAL AND APPLIED GENETICS
卷 111, 期 2, 页码 226-232出版社
SPRINGER
DOI: 10.1007/s00122-005-2003-y
关键词
yam; Dioscorea rotundata; ploidy level; microsatellite; isozyme; segregation
The cultivated yam species Dioscorea rotundata (2n=40) has been considered by most authors as a tetraploid species with a basic chromosome number of ten. In this paper, we analysed the segregation of two isozyme loci and six microsatellite markers in the progeny of a self-fertilised monoecious plant. For the eight markers, segregation patterns could be explained by only two genetic models: diploidy or tetraploidy with two null alleles. Given the nature of studied markers, the most parsimonious hypothesis was that the parental plant was diploid. These results, data from a diversity survey and results of other authors led to the conclusion that D. rotundata is a diploid species.
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